Question

in 3 cosulete sunt80 de nuci.in primele 2 sunt 40 de nuci ,iar in ultimele 2 sunt 57 de nuci.cate nuci sunt in fiecare cosulet?

Answer 1

a+b+c=80

a+b=40

b+c=57

adunam ultimele 2 relatii:

a+b+c+b=40+57

80+b=97

b=97-80

b=17

a=40-17

a=23

c=57-17

c=40

Answer 2

a= primul cosulet

b= al 2 lea cosulet

c= al 3 lea cosulet

a+b+c=80

a+b=40

b+c=57

c=80-40

c=40

b+40=57

b=57-40

b=17

a+17=40

a=40-17

a=23

verificare : 23+17+40=80